PORSCHE RACING HISTORYJim Rothbarth (USA)
1988
31 January 1988 - Daytona 24 Hours - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 15 | Porsche 962 | 962-HR2 | GTP | Jim Rothbarth (USA)/Bernard Jourdain (MEX)/Michel Jourdain, Sr (MEX)/Rob Stevens (USA) | Kalagian Racing | 5th | 5th | 12th | 680 laps |
28 February 1988 - Miami 3 Hours - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 15 | Porsche 962 | 962-HR2 | GTP | Jim Rothbarth (USA)/Bernard Jourdain (MEX) | Kalagian Racing | 18th | 13th | 17th | 109 laps - DNF |
19 March 1988 - Sebring 12 Hours - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 15 | Porsche 962 | 962-HR2 | GTP | Jim Rothbarth (USA) | John Kalagian Racing | 62nd | 16th | 10th | 21 laps - Accident |
10 April 1988 - Road Atlanta 500 km - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 15 | Porsche 962 | 962-HR2 | GTP | Jim Rothbarth (USA)/Doc Bundy (USA) | Kalagian Racing | 7th | 7th | 12th | 119 laps |
24 April 1988 - West Palm Beach 3 Hours - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 15 | Porsche 962 | 962-HR2 | GTP | Jim Rothbarth (USA)/Bernard Jourdain (MEX) | Kalagian Racing | 6th | 6th | 15th | 142 laps |
30 May 1988 - Lime Rock 150 laps - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 15 | Porsche 962 | 962-HR2 | GTP | Bernard Jourdain (MEX)/Jim Rothbarth (USA) | Kalagian Racing | 8th | 8th | 10th | 142 laps |